Pneumatic tire

Abstract

A pneumatic tire ( 10 ) is provided with turbulence generating projections ( 100 ) extending in a tire radial direction and arranged in the tire side portion ( 30 ) located between the tread ( 20 ) and beads. If the length of each turbulence generating projection ( 100 ) in the radial direction of the tire is L, the Young's modulus of the material which forms the turbulence generating projection ( 100 ) is E, and the second moment of area of a cross section of the turbulence generating projection ( 100 ) taken perpendicularly to the extending direction of the projection is I, the turbulence generating projections ( 100 ) satisfy the relationship of L 2 ≦3.5×E×I. The configuration assures the effect of heat dissipation of the tire side portion and minimizes deformation of the turbulence generating projections caused by oil flying from the outside.

1 . A pneumatic tire comprising a turbulent generating projection extending along a tire radial direction, on a tire side portion positioned between a tread and a bead, wherein
 when L denotes a length of the turbulent generating projection along the tire radial direction, E denotes a Young's modulus of a forming material that forms the turbulent generating projection, and I denotes a second moment of area of a cross section of the turbulent generating projection perpendicularly intersecting in the direction in which the turbulent generating projection is extending,   the turbulent generating projection satisfies the relationship of L 2 ≦3.5×E×I.   
     
     
         2 . The pneumatic tire according to  claim 1 , wherein
 the turbulent generating projection includes at least a first projection and a second projection separated from the first projection,   the second projection is provided at a different position from the first projection in a tire circumferential direction, and   the end portion inside of the tire radial direction of the first projection overlaps the end portion outside of the tire radial direction of the second projection in the tire radial direction.   
     
     
         3 . The pneumatic tire according to  claim 2 , wherein
 the second projection is adjacent to the first projection in the tire circumferential direction, and   a predetermined gap is formed between the first projection and the second projection.   
     
     
         4 . The pneumatic tire according to  claim 3 , wherein the predetermined gap is equal to or less than a width of the turbulent generating projection along the tire circumferential direction. 
     
     
         5 . The pneumatic tire according to  claim 1 , wherein a width of the turbulent generating projection along the tire circumferential direction is 2 mm or more and 10 mm or less. 
     
     
         6 . The pneumatic tire according to  claim 1 , wherein a height of the turbulent generating projection is 3 mm or more and 25 mm or less. 
     
     
         7 . The pneumatic tire according to  claim 1 , wherein in a state when the pneumatic tire is assembled in a rim wheel, a distance from an upper end of a rim flange of the rim wheel up to a lower end of the turbulent generating projection is 50 mm or more and 250 mm or less. 
     
     
         8 . The pneumatic tire according to  claim 6 , wherein the height of the turbulent generating projection is 10 mm or more and 25 mm or less.